Here is a simple code example of a button wrapped in a link. If you required styling other than Webflow’s default, then create a button somewhere, style it with a class, add a class to the button. The link should point to the URI you desire.
When you want to do something custom you need #somecode
<a href="//somelink">
<button type="button" class="w-button yourclass">
Click Me
</button>
</a>